[Twisted-Python] t.w.w.form maybe bug?

Tue Jul 22 12:48:07 EDT 2003

Hello, 
I am trying to create a page with a list of elements that can be possibly 
edited by the user, along with a form to edit the elements or insert new 
ones.

So, I setup the things as follows:

class Test(page.Page)
    template = """
<html>
<head></head>
<body>
        <table border="1" cellpadding="2" width="80%" model="configs" 
view="List">
            <tr 
pattern="listHeader"><th>&nbsp;</th><th>Nome</th><th>Limiti</th><th>Bilanciamento</th></tr>
            <tr pattern="listItem" view="conf"></tr>
        </table>
        <div><form method="POST" action="/balancing/edit" 
model="editform"></form></div>
</body>
</html>
""" 
    def wmfactory_configs(self, request):
        cf = libra.RouteConfig()
        return cf.configurations()

    def wmfactory_editform(self, request):
        return self._form

    def wchild_edit(self, request):
        fp = form.FormProcessor(self._form, callback=lambda x: 
util.Redirect("/balancing"))
        fp.mangle_timein = fp.mangle_multi
        return fp

    def wvupdate_conf(self, request, node, data):
        r = microdom.lmx(node)
        d = r.td()
        d.a(href="/balancing/?action=edit&cfg=%s"%data[0]).text("Modifica")
        d.br()
        d.a(href="/balancing/?action=delete&cfg=%s"%data[0]).text("Elimina")
        r.td().text(data[0])
        ((h0,m0,s0),(h1,m1,s1)) = data[1]["limit"]
        r.td().text("dalle %02d:%02d:%02d alle 
%02d:%02d:%02d"%(h0,m0,s0,h1,m1,s1))

        bl = ["%s: %d%%"%(k,v) for (k,v) in data[1]["weights"]]
        d = r.td()
        for l in bl:
            d.text(l)
            d.br()

    def setUp(self, request, d):
        self._action = request.args.get("action",[""])[0]

        if self._action == "delete":
            cf = libra.RouteConfig()
            cf.delCfg(request.args.get("cfg",[""])[0])
            cf.save()

        if self._action == "edit":
            cf = libra.RouteConfig()
            c = cf.getCfg(request.args.get("cfg",[""])[0])
            args = [
                fm.Hidden("action","edit"),
                lw.Static("Nome",request.args.get("cfg",[""])[0]),
                lw.Static("Dalle","%02d:%02d%02d"%c['limit'][0]),
                lw.Static("Alle","%02d:%02d%02d"%c['limit'][1]),
                ]

            for (k,v) in c["weights"]:
                args.append(fm.String(k, str(v)))

            cfs = fm.MethodSignature(*args)
            self._form = cfs.method(self.processEdit)
        else:
            cfs = fm.MethodSignature(
                fm.Hidden("action","new"),
                fm.String("Nome"),
                lw.Timein("Dalle",(00,00,00)),
                lw.Timein("Alle",(23,59,59))
                )
            self._form = cfs.method(self.processEdit)

    def processEdit(self,**kw):
        if kw["action"] == "new":
            print "new", kw
        else:
            print "edit", kw

one thing to notice: the page is not part of an .rpy, but it's added as child 
of the root page using putChild

The first time the page is rendered, i get the form I espect (the second one 
defined in setUp).

If I follow a link that should end up with the first form displayed, nothing 
happens (better, I am presented with the same form again and again).

digging into t.w.w.form.FormFillerWidget, I notice the following (around line 
280):
	argList = self.model.fmethod.getArgs()

That means the widget is rendered using the model it was built with, not the 
model that is passed in setUp(self, request, node, data)

Now the questions:

1. I am doing things really wrong here?
2. the fact that the render-time model is completely ignored is by design or a 
bug?
3. would changing the line above to read "argList = data.getArgs()" really 
solve the issue (here it seems to work) or it will introduce some subtle bugs 
I'm not aware of?

Thanks in advance for the help

-- 
Linux webmaster & sysadmin
pradu at pradu.it